JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Overview

Course overview: The aim is to introduce students the overview of the non destructive testing methods of materials. The course covers NDE, Ultrasonic, MPI testing of metal parts. It gives an idea about selection of the testing criteria. It briefly describe the thermo-graph and radio graph methods of testing and provide selection properties for different tests.

Course Objectives

This course has the basic idea of the properties of steal and ferrous

metals. The objectives aim to:

• 1. Identify the basic methods of testing.
• 2. Understand the concept of non destructive testing.
• 3. Describe the various types of NDT tests carried out on components.
• 4. Describe ultrasonic method of testing the materials.
• 5. Analyze the different types of test carried out on components and surfaces.
• 6. Understand the properties of materials suitable for NDT test.
• 7. Understand the radiography uses in engineering.

Course Outcomes

At the end of the course the students are able to:

• 1. Identify the requirements of testing criteria as per material composition.
• 2. Understand the theory of non destructive testing methods is used.
• 3. Determine the type of requirement of non destructive test.
• 4. Distinguish between the various NDT test as Ultrasonic and Eddy current methods.
• 5. Understand the properties of radiation used in engineering.
• 6. Describe the various types of non destructive test used to determine the surface cracks.

UNIT - I

Overview of NDT - NDT Versus Mechanical testing, Overview of the Non Destructive Testing Methods for the detection of manufacturing defects as well as material characterization. Relative merits and limitations, various physical characteristics of materials and their applications in NDT, Visual inspection.

UNIT - II

Surface NDE Methods: Liquid Penetrant Testing – Principles, types and properties of liquid penetrants, developers, advantages and limitations of various methods, Testing Procedure, Interpretation of results. Magnetic Particle Testing- Theory of magnetism, inspection materials Magnetization methods, Interpretation and evaluation of test indications, Principles and methods of demagnetization, Residual magnetism.

UNIT - III

Thermography and Eddy Current Testing - Principles, Contact and non contact inspection methods, Techniques for applying liquid crystals, Advantages and limitation – infrared radiation and infrared detectors, Instrumentations and methods, applications. Eddy Current Testing-Generation of eddy currents, Properties of eddy currents, Eddy current sensing elements, Probes, Instrumentation, Types of arrangement, Applications, advantages, Limitations, Interpretation/Evaluation.

UNIT - IV

Ultrasonic Testing and Acoustic Emission - Ultrasonic Testing-Principle, Transducers, transmission and pulse-echo method, straight beam and angle beam, instrumentation, data representation, A/Scan, B-scan, C-scan. Phased Array Ultrasound, Time of Flight Diffraction. Acoustic Emission Technique IV Principle, AE parameters, Applications

UNIT - V

Radiography - Principle, interaction of X-Ray with matter, imaging, film and film less techniques, types and use of filters and screens, geometric factors, Inverse square, law, characteristics of films – graininess, density, speed, contrast, characteristic curves, Penetrameters, Exposure charts, Radiographic equivalence. Fluoroscopy- Xero-Radiography, Computed Radiography, Computed Tomography

TEXT BOOKS:

• 1. Baldev Raj, T. Jayakumar, M. Thavasimuthu, Practical Non-Destructive Testing¡¨, Narosa Publishing House, 2009.
• 2. Ravi Prakash, Non-Destructive Testing Techniques¨, 1st revised edition, New Age International Publishers, 2010

REFERENCES:

• 1. ASM Metals Handbook, ¨Non-Destructive Evaluation and Quality Control¨, American Society of Metals, Metals Park, Ohio, USA, 200, Volume-17.
• 2. Paul E Mix, “Introduction to Non-destructive testing: a training guide”, Wiley, 2nd Edition New Jersey, 2005
• 3. Charles, J. Hellier, Handbook of Non-destructive evaluation”, McGraw Hill, New York 2001. B.TECH. MECHANICAL ENGINEERING (MATERIAL SCIENCE AND NANOTECHNOLOGY)